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no Model.) 2 Sheets-Sheet 1. J. A. COLEMAN. SEWER TRAP.

No. 459,440. Patented Sept. 15, 1891'.

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UNITED STATES ATENT O FICE,

JOHN ADDISON COLEMAN, OF PROVIDENCE, RHODE ISLAND.

SEWER-TRAP,

SPECIFICATION forming part of Letters Patent No. 459,440, datedSeptember 15, 1891.

Application filed March 7, 1891. Serial No. 384,182. (No model.) 3

To all whom it may concern:

Be it known that I, JOHN ADDISON COLE- MAN, of Providence, in the countyof Providence and State of Rhode Island, have invented a new and usefulImprovement in Sewer-Traps, of which the followingis a specification.

My improvement relates to sewer-traps for use in catch-basins of sewers;and it consists in certain new and improved constructions andcombinations of the several parts thereof, substantially as hereinafterdescribed and claimed.

In the drawings, Figure 1 is a top plan view of a catch-basin of astreet-sewer which has my invention applied to it. Fig.2 is a verticalcentral transverse section of the same. Fig. 3 is a side elevation oflny'detachable trap removed from the catch-basin. Fig. 4 is a frontelevation of the same. Fig. 5 is a rear elevation of the same. Fig. 6 isa vertical central section through the same. Fig. '7 is a top plan viewof the same.

A is the catch-basin, built in circular form, of suitable material,below the level of the sidewalk B. It has walls of brick or masonry aand a bottom I), which extend below the orifice c in its side, throughwhich the water caught in it flows to the sewer.

S is the street-level, which is so constructed with relation to thecap-stone b of the catchbasin as to form the entrance .9 at thestreetgutter for waste water to run from the street into thecatch-basin.

In order to prevent the sewer-gas from flowing backward from the outlet0 into the catchbasin and thence into the street, a trap has to beformed over the outlet, which will prevent the backward flow of thesewer-gas into the catch-basin and allow the waste water to escapethrough the outlet. Heretofore such a trap has been built or formed inthe wall a around and below the escape-outlet c, and various forms ofsliding walls or partitions have been devised in the trap, to be removedwhen the outlet 0 needs to be exposed to be cleaned out. Sometimes,also, a mere hood was hung over the outlet of the catch-basin, whichdepended upon the water contained in the catch-basin to form the sealand trap the outcatch-basin.

by scooping out their contents, whether semi: fluid or solid, by hand orwith small scoops or dippers, and this was a slow and expensive process,as the person doing it must descend through the man-hole a of thecatchbasin and remain in a constrained position while doing the work.The sliding walls or partitions of these traps were also expensive toconstruct and liable to rust or clog up so as to become immovable. Thehood suspended over the catch-basin outlet also required that the waterin the catch-basin should be present to trap such outlet, and thereforethat the catch-basin should be refilled every time it was cleaned out,at great expense and trouble. In order to avoid these difliculties, Ihave devised a trap T to be applied to the outlet 0 in the catch-basin,which is made in one piece and is removable, so that it can be takenaway from the outlet and emptied or cleaned out by inverting and washingit out by drawing itout of the catch-basin through the man-hole a andthe outlet 0 may also be cleaned out after it is removed.

T is the trap, cast in one piece and formed with the downwardpassage-way 1 and the upward passage-way 2, opening into each otherunder the partition 3, which extends downward below the outlet-tube 4,through which the waste water flows into the outlet 0 of the Thisenables the water standing in the trap to always have its level abovethe lower end of partition 3, and thus seal the trap, so as to preventthe escape of sewergas into the catch-basin. This is very important,because the catch-basin may thus be bailed out and cleaned withoutuntrapping its outlet and need not be afterward refilled in order totrap the same again. The outlet tube 4 is smaller than theoutlet-passage c of the catch-basin, so as to readily enter and projecta short distance into the latter when the trap is in place in thecatch-basin, and the trap is formed with its rear wall 5 slightly convexon the outside around the tube 4, so as to establish a close fit againstthe wall of the catch-basin around the outlet 0.

In order to secure the trap in place in the catch-basin, a hook 6 isdriven into the wall of the latter at the proper distance above theoutlet 0 to suspend the trap in its normal po-' sition with tube 4entered into outlet 0. Ears ICO 7 7 are cast on the trap through holesin which a bolt or pin 8 is passed, forming an eye to drop over the hook6 and sustain the trap on the latter.

Before hanging the trap on the hook 6 its rear convex wall around thetube 4: and the heel part of the tube is smeared with stiff lime putty,which adheres to the wall of the catch-basin and the inside of outlet 0when the trap is hung in place and forms a gas-tight joint between themand the trap, preventing the escape of sewer-gas between them. If at anytime the lower bend of the trap becomes filled with sand or dirt, whichsettles in it, a hook can be let down through the man-hole a of thecatch-basin and hooked into the eye of the trap, and it can be liftedoff the hook G and drawn out through the man-hole and washed and cleanedout and returned to place without even descending into the catch-basin.The outlet 0 into the sewer can also be cleaned out at the same time bya hose introduced through the man-hole. The catch-basin itself can alsobe cleaned out when the trap is removed much easier than if the latterwere permanently secured in it and not removable.

The expense of constructing the trap and securing it in the catch-basinis also reduced to a minimum according to this plan. WVhat I claim asnew and of my invention 1s 1. The combination of the catch-basinprovided with the outlet 0 in its side wall, with the removable trap T,applied to the outlet 0 and provided with the partition 3, extendingbelow the outlet 0 and arranged to form a water seal in the trap belowthe level of the water contained therein, substantially as described.

2. The combination of the catch-basin provvided with the outlet 0 in theside wall thereof, with the removable trap T, applied to the outlet 0and provided with the tube 4, entering said outlet, and the partition 3,extending below the tube 4: and arranged to form a water seal in thetrap below the level of the water contained therein, substantially asdescribed.

3. The combination of the catch-basin provided with the man-hole a inits top and the outlet 0 in the side wall thereof, with the removabletrap, made small enough to pass through said man-hole, applied to theoutlet 0 and provided with the partition 3, extending below the outlet 0and arranged .to form a water seal in the trap below the level of thewater contained therein, substantially as described.

4. The combination of the catch-basin provided with the outlet c in theside wall thereof, with the removable trap having the convex rear walland the tube 4 extending therefrom into outlet 0, and also having thepartition 3 extendingbelow said tube and arranged to form a water sealin the trap below the level of the water contained therein,substantially as described.

JOHN ADDISON COLEMAN.

Witnesses:

O. LAPHAM, R. E. LYMAN.

